The Shop > Composites & Plastics

Soda blasting shiny plastics

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bry1975:
Thanks Jason,

I veered from the micromesh route but should try it and polish in one direction.

That's the scratched glossy dial that has been light soda lime blasted with around 15-20psi tops and assembled minus the glass:-



Some of my clients can be quite picky hence have to try and either eliminate,  remove or blend scratches out.  FYI the dial is usually totally transparent and not opaque as the solar panel is directly underneath,  the watch charged perfectly under a UV lamp and should keep a charge for hours if not days.

Topos:
A technique I picked up in 1956 at the MIT machine shop was to use toothpaste to
polish plastic. They were making one foot plastic hemi-sphere for a reconnaissance planes.
The final polish was tooth paste and fingers.


 In particular with my 1978 Rolex Sea Dweller I have over the intervening
years polished out scratches with Ultra Brite Tooth paste. Put a dab on the crystal,
wet my thumb, and rubbed in circular patterns. The wet paste works wonders. Patience and multiple applications
for tough scratches. My original crystal is still pristine even though
it has seen many dives.

bry1975:
Thanks Topos,

Yea hydrated silica in toothpaste works quite well the more modern acrylic polishing pastes these days are polywatch or xerapol sadly that wouldn't work to well with a glossy dial as you'd still get scratch marks in a certain light.

Marauder:
The front plastic windows of my caravan was getting hard to look through,Some one said you need to rub in and polish off  with some of that car paint color restorer called  T Cutt,Ok went to Halfords purchased a bottle came back home and and gave it a go ..It works..Made them look like new,Since tried it on many other plastic acrylic surfaces it works.

Shadow:
I have used regular silverware polish to restore dial indicator crystals or acrylic parts. I also use it to polish aluminum. For flat surfaces I put some on a piece of copy paper backed by a flat surface and rub the item over it.

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